Can Vancomycin stop working?

I'm on my 3rd round of vanco after it was confirmed that I still have c.diff (1st instance was at the end of December). The first 2 times I took the antibiotic, it quickly resolved my symptoms. This time, I'm not really getting better. I'm not having diarrhea, just frequency. I've been on it for a little less than 2 weeks. This round will be a long round, a 56-day taper. I'm trying to be really careful to make sure I never miss a dose and that I take it every 6 hours.

I know it's always a possibility that I'm flaring, but I don't think so. The only other thing I can think of is that I'm not eating well. But before I try to eliminate things from my diet again, I wanted to know if vanco can just stop being effective after you've taken it a few times.

This sucks, I just want to get through my work day without constantly having to think about finding an available, private bathroom.

flaring would be my guess -

Yes, Dificid is the alternative to Vanco. It is a little more effective but it costs more so insurance companies usually require you to fail Vanco first before they will approve it. You can also do the FMT if nothing else works.